Hi Hap,
Good for you for making a decision. That is hard as you don't know the outcome.
I hope for your sake and the welfare of your kids that you are chosing wisely (I mean that sincerely). They are children and SHE is an adult capable of caring for herself, they are not.
Like Bernadette said, what parameters do you have for her or for yourself? You are no longer blind as to what might happen, so with your knowledge, what boundaries will you put in place? You don't have to share, but I just wanted to add my 2 cents.
Lastly, what are you going to do for yourself? How will you take care of your emotional needs on a daily and weekly basis? As you know what might happen, I hope that you enact "wife proof" measures that you can turn to in moments of negative thinking. You sound like a sweet man and your needs are just as important as hers.
Miss